Apparatus for cooling cylinders



June 24, 1947. sw 2,422,936

APPARATUS FOR COOLING CYLINDERS Filed April 21, 1944 2 Sheets-Sheet 1INVENTOR Russc II P Sweger BY June 24, 1947. R. P. SWEGER 2,422,935

APPARATUS FOR COOLING CYLINDERS Filed April 21, 1944 2 Sheets-Sheet 2 Ia a INVENTOR Russzll P. Suleger 3 44 MOW A RriEYs Patented June 24, 1947APPARATUS FOR COOLING CYLINDERS Russell P. Sweger, Rockford, Ill.,assignor. to Barher-Colman Company,- Rockford, Ill., a corpo ration ofIllinois Application April 21, 12544, Serial No. 532,089 4 Claims. (Cl.257 -261) This invention relates to bafiles for use in the cooling ofcylinders, particularly cylinders of internal combustion engines havingexternal cooling fins extending therearound.

The practice in cooling such cylinders is to direct streams of airtangentially past each cylinder, and then lead the air streams towardeach other around the cylinder to an intermediate outlet where thestreams converge and pass out. There is a continuous dead air pocketformed along an element of the cylinder where the streams converge, andthe area of the cylinder exposed to this pocket is not cooled properly.

The primary object of the present invention is to overcome thisdifliculty by providing a novel means for baiiiing the cylinder.

Another object is to divide the two air streams into separate parts andto distribute the parts to a plurality of outlets which are spacedaxially and circumferentially oi the cylinder thereby avoiding acontinuous dead pocket along an element of the cylinder.

The invention also resides in the novel construction of the baiiie forcarrying out the foregoing objects.

Other objects and advantages of the invention will become apparent fromthe following detailed description taken in connection with theaccompanying drawings, in which Figure 1 is a fragmentary elevationalview of a radial type internal combustion engine equipped with bafflesconstructed in accordance with the present invention.

Figs. 2, 3, and 4 are enlarged fragmentary sectional views takenrespectively along the lines 2-4, 3--3, and 4-4 of Fig. 1.

Fig. 5 is a fragmentary perspective view of one of the cylinders and itsbaflie.

Fig. 6 is a fragmentary cross-sectional view taken along the line 6-6 ofFig. 1.

While the invention is susceptible of various modifications andalternative constructions and of being practiced in various ways, I haveshown in the drawings and will herein describe in detail the preferredembodiment and manner of carrying out the invention. It is to beunderstood,

however, that I do not intend to limit the invention by such disclosure,but aim to cover all modifications, alternative constructions andmethods falling within the spirit and scope of the invention asexpressed in the appended claims.

In the drawings, the invention is illustrated in connection with thecooling of a cylinder ID of a so-called radial internal combustionengine, each cylinder having fins ll lying in planes perpendicular tothe cylinder axis and closely spaced to each other so as to providesurfaces 01! substantial area over which a cooling medium such as airmay be directed to cool the cylinder. In accordance with the usualpractice, a bafiie l2 constructed of sheet metal is mounted on theengine in any suitable way and formed with annularly spacedsemi-cylindrical members B which fit closely around the rear or downstream sides of the cylinders and are connected by interveningimperforate webs l4. With this arrangement, a body of air directedagainst the front of the engine is divided by the cylinders l0 intostreams A and B which flow around the cylinders into thecircumferentially extending spaces defined by the flns II, the externalcylinder surface, and the bafiie member I3.

The present invention aims to avoid the formation of a continuous deadspot along the cylinder at the points where the streams A and B impingeagainst each other. To this end, the two air streams flowing around eachcylinder are divided into a plurality of corresponding increments whichconverge upon each other and on the rear side of the cylinder and flowout through openings l5 and I6 which are spaced apart bothcircumferentially and axially of the cylinder so as to stagger the deadareas ll and ill of the adjacent pairs of impinging stream increments.

To carry out this method, the outlet openings l5 and it, which aresomewhat elongated in a circumferential direction, are arranged in tworows extending parallel to the cylinder axis but circumferentiallyspaced apart so as to leave imperforate areas i5 0! the bailie i3intervenin between the holes l5, and similar imperforate areas itbetween the holes iii of the other row.

The holes l5 and 16 are formed by striking metal out of the bailiemember l3 to form flanges l5 and I6 projecting toward the cylinder fromthe concave side of the baille. These flanges thus extendcircumferentially, and their spacing is correlated with the spacing ofthe flnsli so that the adjacent flanges of each row register and liesubstantially in abutment with alternate ones of the cylinder fins (seeFig. 2).

It will be observed that the flanges iG cooperate with the interveningbailie area It to define a circumferentially extending passage forcarrying a portion of the air stream A past the adjacent holes It to ahole l5 which lies in the same axial plane as this portion a of thestream. Similarly, the adjacent fins li cooperate with intervening areasl5 to define passageways which aeaaoao 3 carry portions b of the airstream 13 past the holes I5 and deliver these stream increments to thecorrespondingly spaced holes I at which point the increments b convergeupon the stream increments a and are discharged outwardly through theholes It as illustrated-in Fig. 3. In a similar way, the increments b ofthe stream B and the increments a of the stream A which are carried pastthe holes I converge upon each other as illustrated in Fig. 4 and arediverted outwardly through the openings II. The dead areas It formed bythe converging stream increments aand b are spaced circumferentiallyaround the cylinder I0 from the pocket I! formed between the convergingstreams A and B with the result that there is no continuous element ofthe cylinder exposed to a dead area. Accordingly. each area of thecylinder I which is exposed to one of the dead air areas I! or II is ofcomparatively small dimension and is flanked on all four sides by areasof the cylinder which are exposed to the moving area and, therefore, iscooled by thermal conduction from the latter areas. As a result, thetemperature of the cylinderopposite the air outlets is reducedconsiderably, and the cylinder is therefore cooled more effectively.Moreover, the flanges Iii and IE divide the air streams A and B andguide the increments to the outlets in well defined paths therebyavoidin turbulence which further contributes to the cooling emciency.

I claim as my invention:

1. A device for bafliing a cylinder comprising a semi-cylindrical memberadapted to fit around one side of said cylinder in spaced relationthereto to provide air passages between the cylinder and the concavesurface of said member, said member having intermediate its edges tworows of holes therein staggered along an element of the semi-cylinder,and circumferentially extending flanges projecting from said concavesurface at opposite edges of said holes and disposed substantiallyperpendicular to such surface, the adjacent flanges in each row of holescooperating with each other and the intervening imperforate portion ofsaid member to define a passage for directing an air streamcircumferentially along said concave surface and past the holes of suchrow to a hole of the other row.

2. A device for bathing a cylinder having axially spaced peripheralcooling fins, said device comprising a semi-cylindrical member adaptedto fit around one side of said cylinder adjacent said fins and havingintermediate its edges rows of holes therein staggered along an elementof the semi-cylinder with the spacing of the holes in each row correlatd with the spacing of said fins, and circumferent ally extending flangesprojecting from the concave surface on opposite sides of said holes andspaced apart to register individually with said fins, the adjacentflanges form rows of holes staggered relative to each other, thestruck-out metal forming flanges at opposite edges of the holes andextending circumferentially of the baffle whereby the adjacent flangescoact with each other to form an air passage.

4. A baflle for directing a cooling medium around an engine cylinder.comprising an arcuate piece of sheet metal having the metal thereofintermediate its edges struck inwardly from the concave side of thepiece to form rows of holes staggered relative to each other, thestruck-out metal forming generally parallel flanges disposed at oppositeedges of the holes and substantially perpendicular to said concave sideand extending circumferentially of the baflie whereby the adjacentflanges form an air passage between them.

RUSSELL P. SWEGER.

0 REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,031,891 Irgens Feb. 25, 1936674,276 Hanson May 28, 1901 FOREIGN PATENTS Number Country Date 110,125Great Britain Oct. 11, 1917

